Baseline Widely available
The KeyboardEvent.altKey
read-only property is a boolean value that indicates if the alt key (Option or ⥠on macOS) was pressed (true
) or not (false
) when the event occurred.
A boolean value.
Examples<p>
Press any character key, with or without holding down the ALT key.<br />
You can also use the SHIFT key together with the ALT key.
</p>
<pre id="output"></pre>
const output = document.getElementById("output");
function showChar(e) {
output.textContent = `Key KeyDown: "${e.key}"
ALT key KeyDown: ${e.altKey}
`;
}
document.addEventListener("keydown", showChar);
Specifications Browser compatibility See also
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HTML:
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| Version:
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